WO1997009567A1 - Cylinder inner pressure detector for diesel engines and method of using the same - Google Patents

Cylinder inner pressure detector for diesel engines and method of using the same Download PDF

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Publication number
WO1997009567A1
WO1997009567A1 PCT/JP1996/002505 JP9602505W WO9709567A1 WO 1997009567 A1 WO1997009567 A1 WO 1997009567A1 JP 9602505 W JP9602505 W JP 9602505W WO 9709567 A1 WO9709567 A1 WO 9709567A1
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WO
WIPO (PCT)
Prior art keywords
glow plug
cylinder
power supply
pressure sensor
cylinder pressure
Prior art date
Application number
PCT/JP1996/002505
Other languages
French (fr)
Japanese (ja)
Inventor
Naoki Tomisawa
Original Assignee
Unisia Jecs Corporation
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Unisia Jecs Corporation filed Critical Unisia Jecs Corporation
Priority to DE19680912T priority Critical patent/DE19680912C2/en
Publication of WO1997009567A1 publication Critical patent/WO1997009567A1/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
    • F02P19/00—Incandescent ignition, e.g. during starting of internal combustion engines; Combination of incandescent and spark ignition
    • F02P19/02—Incandescent ignition, e.g. during starting of internal combustion engines; Combination of incandescent and spark ignition electric, e.g. layout of circuits of apparatus having glowing plugs
    • F02P19/028—Incandescent ignition, e.g. during starting of internal combustion engines; Combination of incandescent and spark ignition electric, e.g. layout of circuits of apparatus having glowing plugs the glow plug being combined with or used as a sensor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
    • F02P13/00—Sparking plugs structurally combined with other parts of internal-combustion engines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23Q—IGNITION; EXTINGUISHING-DEVICES
    • F23Q7/00—Incandescent ignition; Igniters using electrically-produced heat, e.g. lighters for cigarettes; Electrically-heated glowing plugs
    • F23Q7/001—Glowing plugs for internal-combustion engines
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L23/00—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid
    • G01L23/08—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid operated electrically
    • G01L23/10—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid operated electrically by pressure-sensitive members of the piezoelectric type
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L23/00—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid
    • G01L23/22—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid for detecting or indicating knocks in internal-combustion engines; Units comprising pressure-sensitive members combined with ignitors for firing internal-combustion engines
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L23/00—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid
    • G01L23/22—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid for detecting or indicating knocks in internal-combustion engines; Units comprising pressure-sensitive members combined with ignitors for firing internal-combustion engines
    • G01L23/221—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid for detecting or indicating knocks in internal-combustion engines; Units comprising pressure-sensitive members combined with ignitors for firing internal-combustion engines for detecting or indicating knocks in internal combustion engines
    • G01L23/222—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid for detecting or indicating knocks in internal-combustion engines; Units comprising pressure-sensitive members combined with ignitors for firing internal-combustion engines for detecting or indicating knocks in internal combustion engines using piezoelectric devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23Q—IGNITION; EXTINGUISHING-DEVICES
    • F23Q7/00—Incandescent ignition; Igniters using electrically-produced heat, e.g. lighters for cigarettes; Electrically-heated glowing plugs
    • F23Q7/001—Glowing plugs for internal-combustion engines
    • F23Q2007/002—Glowing plugs for internal-combustion engines with sensing means

Definitions

  • the present invention relates to an in-cylinder pressure detecting device for detecting a pressure in a cylinder of a diesel engine and a method of using the device.
  • a ring-shaped pressure sensor 20 is exposed to a sub-chamber (or a main combustion chamber) of a diesel engine.
  • a sub-chamber or a main combustion chamber
  • the mounting seat surface of the provided glow plug 30 and the cylinder head 10 are sandwiched and fixed.
  • the pressure sensor 20 fixed to the cylinder head 10 causes distortion of the piezoelectric element according to the combustion pressure.
  • the in-cylinder (combustion) pressure is detected.
  • the structure of the pressure sensor 20 is, for example, as shown in FIG. 4, centered on a ring-shaped central electrode 21, two piezoelectric elements 22 on both sides thereof, and The upper electrode 23 and the lower electrode 24 are sequentially laminated, and the inner and outer peripheries are integrally fixed with an insulating molding member 25.
  • the center electrode 21 forms the lead wire 26 with the molding member. It is to be taken out through 25.
  • the conventional one does not directly detect the in-cylinder pressure by directing a pressure sensor directly into the cylinder, but instantaneous elastic deformation due to a change in the in-cylinder pressure of a relatively rigid cylinder head ( (Displacement) to detect the in-cylinder pressure indirectly, and there was concern that the in-cylinder pressure could not be detected with high accuracy.
  • the present invention has been made in view of such a conventional situation, and has a simple configuration, good workability, and no problem in installation space, and a diesel engine capable of detecting cylinder pressure with high accuracy.
  • An object of the present invention is to provide an in-cylinder pressure detecting device and a method of using the device. It is also an object of the present invention to further simplify the configuration, reduce costs, and improve workability.
  • the in-cylinder pressure detection device for a diesel engine includes:
  • a cylinder pressure receiving member that receives the action of the cylinder pressure of the glow plug disposed facing the cylinder, and a fixing member that fixes the cylinder pressure receiving member to the glow plug body.
  • a pressure sensor is interposed between them.
  • the pressure sensor is sandwiched between the in-cylinder pressure receiving member of the glow plug (for example, a ceramic heater portion) and the fixing member for fixing this to the glow plug body.
  • the pressure sensor detects the displacement of the in-cylinder pressure receiving member that is displaced or deformed by receiving the pressure in the cylinder while facing the inside of the cylinder.
  • the detection accuracy can be greatly improved as compared with the method in which the in-cylinder pressure is detected by indirectly detecting the elastic deformation of the cylinder head.
  • the in-cylinder pressure receiving member is completely independent of the other cylinders and is not affected by the in-cylinder pressure of the cylinders other than the cylinder whose pressure is to be detected.
  • the detection accuracy can be greatly improved as compared with the case where the in-cylinder pressure is detected by detecting the elastic deformation of the cylinder head which is relatively easily affected by the in-cylinder pressure of other cylinders.
  • the pressure sensor is housed inside the glow plug, space can be saved, and the pressure sensor is assembled compared to the conventional one, which is inserted outside the glow plug.
  • the lead wire from the pressure sensor does not reach the outside of the glow plug as in the past, so that the workability is greatly improved and The possibility can be greatly reduced.
  • the output extraction part of the pressure sensor is shared with the power supply terminal of the glow plug,
  • a power supply terminal of the glove lug is connected to a power supply
  • the power supply terminal of the glow plug and the power supply be shut off so that the output of the pressure sensor is taken out from the power supply terminal of the glove lug. .
  • the output harness dedicated to the pressure sensor can be omitted, so that the structure can be further simplified and the cost can be further reduced, and the troublesome harness handling work can be reduced as much as possible.
  • the output of the pressure sensor is preferable not to use the output of the pressure sensor as a detection value when supplying power to the glow plug.
  • FIG. 1 is an overall configuration diagram according to a first embodiment of the present invention.
  • FIG. 2 is a circuit diagram for explaining a common use of a signal extraction unit of a pressure sensor and a power supply terminal for a global plug according to a second embodiment of the present invention.
  • FIG. 3 is a diagram illustrating the overall configuration of a conventional in-cylinder pressure detecting device.
  • FIG. 4 is an enlarged sectional view of a conventional pressure sensor.
  • the pressure sensor 2 is installed inside the glow plug 3 that is attached to the cylinder head 1 directly facing the inside (sub chamber).
  • the pressure sensor 2 includes a ceramic heater portion 4 of a glow plug 3 and a ceramic insulating resin formed by press-fitting into a cylindrical body 15 for fixing the ceramic heater portion 4. It is designed to be sandwiched between a fixing member 6 made of, for example, and.
  • the ceramic heater partially corresponds to the in-cylinder pressure receiving member according to the present invention.
  • the pressure sensor 2 used in the present embodiment may be the same as the conventional one described above, may be a plate shape instead of a ring shape, or may employ another known pressure sensor. You can do it.
  • the lead wire 2 A of the pressure sensor 2 and the glove lug wiring 7 connected to the power supply terminal 8 for the glow plug are passed through the inside of the insulating fixed member 6 so as to be taken out.
  • the fixing member 6 may be formed in a hollow cylindrical shape or the like, and the lead wire 2A or the wiring 7 for the glow plug may be taken out through the hollow portion.
  • the pressure sensor 2 is sandwiched between the ceramic plug part 4 of the glow plug 3 and the fixing member 6, so that the pressure sensor 2 is
  • the displacement of the ceramic heater part 4 that is displaced or deformed by receiving the pressure in the cylinder as it faces the cylinder is directly detected, the elastic deformation of the relatively rigid cylinder head, as in the past,
  • the amount of detection displacement with respect to the change in the in-cylinder pressure can be increased, and the detection accuracy can be greatly improved.
  • the ceramic heater section 4 is completely independent of other cylinders and is not affected by the in-cylinder pressure of the cylinders other than the cylinder whose pressure is to be detected.
  • the detection accuracy is greatly improved as compared to the method that detects the cylinder pressure by detecting the deformation of the cylinder head, which is relatively susceptible to the influence of the cylinder pressure (including the effect of cylinder block deformation). Can be improved.
  • the pressure sensor 2 is housed inside the glow plug 3, space can be saved.
  • the assemblability can be improved, and the lead wire from the pressure sensor is tightened as in the conventional case. Since it is not exposed to the outside of the hexagonal part, the workability can be greatly improved and the possibility of disconnection can be greatly reduced.
  • the fixing member 6 has been described as being formed of ceramic, insulating resin, or the like, but is not limited thereto, and may be a metal member. However, in this case, a shield is required for the lead wire 2 A of the pressure sensor 2 and the wiring 7 for the glow plug.
  • the force described with respect to the ceramic heater set glow plug is not limited thereto.
  • a so-called sheathed glow plug in which a heating coil is provided inside a metallic sheath (sheath), A pressure sensor may be interposed between an end of the metal sheath and a fixing member for fixing the position of the sheath to the body. Even with such a configuration, it is needless to say that the same operation and effect as the above-described operation and effect of the present invention can be obtained.
  • the in-cylinder pressure receiving member that receives the action of the in-cylinder pressure (for example, the ceramic sleeve 4 or the metallic sheath, etc.).
  • a fixing member 6 for fixing the in-cylinder pressure receiving member at a predetermined position of the body 5 of the glow plug, so that the pressure sensor is interposed therebetween.
  • the arrangement and the like of the pressure sensor 2 are basically the same as those in the first embodiment, but the signal extraction unit from the pressure sensor 2 is connected to the power supply for the global plug. (See the broken line in Fig. 1. In other words, as shown by the broken line in Fig. 1, the lead wire 2A is connected to the glove lug wiring 7. By connecting to the supply terminal 8, the lead wire 2A extending to the outside of the glow plug 3 is eliminated.)
  • a battery (not shown) and a power supply terminal 8 are provided.
  • a switch 10 is interposed therebetween, and a part of the ceramic heater 4 and the pressure sensor 2 are connected in parallel on the downstream side of the power supply terminal 8 for the global plug.
  • a charge amplifier 11 for inputting and amplifying the output of the pressure sensor 2 to the power supply terminal 8 for the green plug (the charge amplifier 11 is provided inside or connected to the engine control unit). It is connected.
  • the switch of the switch 10 is switched based on a drive signal from the engine control unit.
  • the signal extraction unit from the pressure sensor 2 can be shared with the power supply terminal 8 for the glow plug because the power supply to the glow plug 3 is normally performed immediately before or at the start. This is due to the fact that the output of the pressure sensor 2 is usually used after the engine is started.
  • the switch 10 when, for example, immediately before and during start-up is detected based on a signal from a key switch (not shown) or the like, the switch 10 is turned on. As a result, before and during the start-up, power is supplied from the battery 9 to the portion 4 of the ceramic plug of the glow plug 3 and the start-up can be favorably performed.
  • the input signal to the charge amplifier 11 is canceled (not used as data) in the engine control unit to prevent erroneous detection of the in-cylinder pressure.
  • the switch 10 is turned off, and the power supply to the ceramic heater part 4 from the battery 9 is stopped. Then, for the first time, the engine control unit uses the signal input from the pressure sensor 2 to the charge amplifier 11 as a signal.
  • the Electricity is normally applied just before or at the time of start-up, and the output of the pressure sensor 2 is usually used after start-up. Since the determination as to whether or not to use the output of the pressure sensor 2 is made, the signal extraction unit from the pressure sensor 2 can be shared with the power supply terminal 8 for the global plug. Accordingly, the output harness of the pressure sensor 2 and the like can be omitted, so that the configuration can be simplified and the cost can be reduced, and the work of arranging the harness can be further reduced.
  • the in-cylinder pressure detecting device and the method of using the device in the present invention described above are not limited to the case where the glow plug is arranged facing the sub-chamber of the sub-chamber type diesel engine.
  • the present invention can also be applied to a case where the glove lug faces the combustion chamber of a diesel engine of a direct injection type or a diesel combustion engine.
  • the in-cylinder pressure detecting device for a diesel engine and the method of using the device according to the present invention have a simple configuration, good workability, and do not cause a problem in installation space. There is an effect that detection can be performed with high accuracy, and therefore, industrial applicability is great.

Abstract

A cylinder inner pressure detector for diesel engines, having a simple construction and a high operation efficiency and capable of saving a space and detecting the inner pressure of a cylinder with a high accuracy; and a method of using the same. A pressure sensor (2) is provided in a glow plug (3) with the sensor held between a ceramic heater portion (4) of the glow plug (3) and a fixing member (6) by which the ceramic heater portion (4) is fixed. Therefore, since the pressure sensor (2) directly detects the displacement of the ceramic heater portion (4), which is displaced by the inner pressure received of a cylinder, and thereby detects the inner pressure of the cylinder, the detecting accuracy can be improved greatly as compared with that of a conventional detector of this kind which is adapted to detect the elastic deformation of a cylinder head and thereby indirectly determine the inner pressure of a cylinder. Since the pressure sensor (2) is provided inside the glow plug (3), the space can be saved, and a lead wire is not exposed to the outside of the glow plug. This enables the operation efficiency to be improved, and the breaking of the wire to be prevented.

Description

明糸田書  Akitoda
ディーゼル機関の筒内圧力検出装置及び該装置の使用方法  In-cylinder pressure detecting device for diesel engine and method of using the device
〔技術分野〕  〔Technical field〕
本発明は、 ディーゼル機関の気筒内の圧力を検出する筒内圧力検出装置及び該 装置の使用方法に関する。  The present invention relates to an in-cylinder pressure detecting device for detecting a pressure in a cylinder of a diesel engine and a method of using the device.
〔背景技術〕  (Background technology)
従来、 ディーゼル機関の筒内圧力を検出する装置としては、 例えば、 第 3図に 示すように、 リング状の圧力センサ 2 0を、 ディーゼル機関の副室 （或いは主燃 焼室） に臨ませて設けられるグロ一プラグ 3 0の取り付け座面と、 シリンダへッ ド 1 0と、 の間に挟み込ませて固定するようにしたものがある。  Conventionally, as a device for detecting the in-cylinder pressure of a diesel engine, for example, as shown in FIG. 3, a ring-shaped pressure sensor 20 is exposed to a sub-chamber (or a main combustion chamber) of a diesel engine. There is one in which the mounting seat surface of the provided glow plug 30 and the cylinder head 10 are sandwiched and fixed.
そして、 グローブラグ 3 0を介してシリンダへッド 1 0に固定された圧力セン サ 2 0は、 燃焼圧力がシリンダへッド 1 0に作用するとその燃焼圧力に応じて圧 電素子の歪みが変化することにより発生電圧が変化するという特性を利用し、 こ れにより筒内 （燃焼） 圧力を検出するようになっている。  When the combustion pressure acts on the cylinder head 10 via the glove lug 30, the pressure sensor 20 fixed to the cylinder head 10 causes distortion of the piezoelectric element according to the combustion pressure. By utilizing the characteristic that the generated voltage changes with the change, the in-cylinder (combustion) pressure is detected.
なお、 圧力センサ 2 0の構造は、 例えば、 第 4図に示すように、 リング状の中 心電極 2 1を中心に、 その両面に 2枚のピエゾ圧電素子 2 2と、 更に、 その外側 に上面電極 2 3と下面電極 2 4を順次積層し、 これらの内外周を絶縁性のモール ド部材 2 5で一体に固定して形成され、 中心電極 2 1からは前記リード線 2 6が モールド部材 2 5を通じて取り出されるようになつている。  The structure of the pressure sensor 20 is, for example, as shown in FIG. 4, centered on a ring-shaped central electrode 21, two piezoelectric elements 22 on both sides thereof, and The upper electrode 23 and the lower electrode 24 are sequentially laminated, and the inner and outer peripheries are integrally fixed with an insulating molding member 25. The center electrode 21 forms the lead wire 26 with the molding member. It is to be taken out through 25.
しかしながら、 上記従来のものでは； 以下のような惧れがあった。  However, the above-mentioned conventional one has the following fears.
即ち、 従来のものは、 直接気筒内に圧力センサを臨ませて筒内圧力を検出する のではなく、 比較的剛性の高いシリンダへッドの筒内圧力変化に起因する瞬間的 な弾性変形 （変位） を検出することで、 間接的に筒内圧力を検出するものであり、 高精度に筒内圧力を検出することができなレ、惧れがあつた。  In other words, the conventional one does not directly detect the in-cylinder pressure by directing a pressure sensor directly into the cylinder, but instantaneous elastic deformation due to a change in the in-cylinder pressure of a relatively rigid cylinder head ( (Displacement) to detect the in-cylinder pressure indirectly, and there was concern that the in-cylinder pressure could not be detected with high accuracy.
また、 シリンダヘッドの弾性変形を検出するのでは、 ディーゼル機関の燃焼圧 力は大きいため他の気筒の燃焼圧力変化による変形なども、 検出しょうとしてい る気筒の燃焼圧力変化による変形として誤検出してしまう等の惧れもあるため、 高精度に筒内圧力を検出することができなレ、惧れがあつた。 し力、も、 従来のものでは、 圧力センサ 2 0からのリード線 2 6がグロ一プラグ 3 0の締付用六角部の外部に剝き出しとなるので、 設置スペースが比較的大きく 必要であると共に、 組み付け作業性等が悪く、 かつリード線 2 6が断線し易い等 の惧れがあった。 Also, when detecting the elastic deformation of the cylinder head, since the combustion pressure of the diesel engine is large, deformation due to a change in the combustion pressure of another cylinder is erroneously detected as a deformation due to a change in the combustion pressure of the cylinder to be detected. It was not possible to detect in-cylinder pressure with high accuracy. In the conventional method, the lead wire 26 from the pressure sensor 20 is exposed outside the hexagonal part for tightening the glow plug 30.Therefore, a relatively large installation space is required. At the same time, there was concern that the workability of assembly was poor, and that the lead wire 26 was easily broken.
本発明は、 かかる従来の実情に鑑みなされたもので、 簡単な構成で、 作業性が よく、 かつ、 設置スペースも問題とならず、 筒内圧力を高精度に検出することが できるディーゼル機関の筒内圧力検出装置及び該装置の使用方法を提供すること を目的とする。 また、 より一層、 構成の簡略化， コスト低減， 作業性改善を図る ことも本発明の目的である。  SUMMARY OF THE INVENTION The present invention has been made in view of such a conventional situation, and has a simple configuration, good workability, and no problem in installation space, and a diesel engine capable of detecting cylinder pressure with high accuracy. An object of the present invention is to provide an in-cylinder pressure detecting device and a method of using the device. It is also an object of the present invention to further simplify the configuration, reduce costs, and improve workability.
〔発明の開示〕  [Disclosure of the Invention]
このため、 本発明にかかるディーゼル機関の筒内圧力検出装置は、  For this reason, the in-cylinder pressure detection device for a diesel engine according to the present invention includes:
気筒内に臨んで配設されるグロ一プラグの筒内圧力の作用を受ける筒内圧カ受 圧部材と、 当該筒内圧力受圧部材をグロープラグ本体に固定しておくための固定 部材と、 の間に、 圧力センサを介装させるように構成するようにした。  A cylinder pressure receiving member that receives the action of the cylinder pressure of the glow plug disposed facing the cylinder, and a fixing member that fixes the cylinder pressure receiving member to the glow plug body. A pressure sensor is interposed between them.
上記構成によれば、 圧力センサを、 グロ一プラグの筒内圧カ受圧部材 （例えば、 セラミックヒーター部等） と、 これをグロ一プラグ本体に固定するための固定部 材と、 の間に挟み込ませるようにしたので、 圧力センサは、 気筒内に臨んで気筒 内の圧力を受けて変位或いは変形する筒内圧カ受圧部材の変位を検出することに なるので、 従来のように、 比較的剛性の高いシリンダヘッドの弾性変形を間接的 に検出して筒内圧力を検出するものに比べ、 大幅に検出精度を向上させることが できる。  According to the above configuration, the pressure sensor is sandwiched between the in-cylinder pressure receiving member of the glow plug (for example, a ceramic heater portion) and the fixing member for fixing this to the glow plug body. As a result, the pressure sensor detects the displacement of the in-cylinder pressure receiving member that is displaced or deformed by receiving the pressure in the cylinder while facing the inside of the cylinder. The detection accuracy can be greatly improved as compared with the method in which the in-cylinder pressure is detected by indirectly detecting the elastic deformation of the cylinder head.
また、 筒内圧カ受圧部材は、 他の気筒から完全に独立しており、 圧力を検出し たい気筒以外の気筒の筒内圧力の影響を受けることがないので、 かかる点でも、 従来のように、 他の気筒の筒内圧力の影響を比較的受け易いシリンダへッドの弾 性変形を検出して筒内圧力を検出するものに比べ、 大幅に検出精度を向上させる ことができることになる。  Also, the in-cylinder pressure receiving member is completely independent of the other cylinders and is not affected by the in-cylinder pressure of the cylinders other than the cylinder whose pressure is to be detected. However, the detection accuracy can be greatly improved as compared with the case where the in-cylinder pressure is detected by detecting the elastic deformation of the cylinder head which is relatively easily affected by the in-cylinder pressure of other cylinders.
更に、 圧力センサをグロ一プラグに内装させたので、 省スペース化が図れると 共に、 圧力センサをグロ一プラグの外部に挿入等した従来のものに比べ、 組み付 け性等を向上させることができると共に、 従来のように、 圧力センサからのリー ド線がグロ一ブラグの外部に剝き出しにならなレ、ので、 作業性の大幅な改善や断 線の可能性を大幅に低減することができることになる。 Furthermore, since the pressure sensor is housed inside the glow plug, space can be saved, and the pressure sensor is assembled compared to the conventional one, which is inserted outside the glow plug. In addition to improving the workability, the lead wire from the pressure sensor does not reach the outside of the glow plug as in the past, so that the workability is greatly improved and The possibility can be greatly reduced.
なお、 前記圧力センサの出力取出し部を、 前記グロ一プラグの電力供給用端子 と共用化し、  In addition, the output extraction part of the pressure sensor is shared with the power supply terminal of the glow plug,
前記グロ一ブラグへ電力を供給する際に、 前記グローブラグの電力供給用端子 と電源とを接続し、  When supplying power to the glove plug, a power supply terminal of the glove lug is connected to a power supply,
その他の場合には、 前記グロ一プラグの電力供給用端子と電源とを遮断して、 前記グローブラグの電力供給用端子から前記圧力センサの出力の取り出しを行な わせるようにするのが好ましい。  In other cases, it is preferable that the power supply terminal of the glow plug and the power supply be shut off so that the output of the pressure sensor is taken out from the power supply terminal of the glove lug. .
これにより、 圧力センサ専用の出力ハーネス等を省略することができるので、 より一層構成の簡略化、 低コスト化が図れると共に、 面倒なハーネスの取回し作 業等を最大限軽減することができるようになる。  As a result, the output harness dedicated to the pressure sensor can be omitted, so that the structure can be further simplified and the cost can be further reduced, and the troublesome harness handling work can be reduced as much as possible. Become like
更に、 前記グロ一プラグへの電力供給時には、 前記圧力センサの出力を検出値 として使用しないようにすることが好ましレ、。  Further, it is preferable not to use the output of the pressure sensor as a detection value when supplying power to the glow plug.
このようにすると、 上述した本発明にかかる各種の作用効果を奏することがで きると共に、 更に、 グロ一プラグへの電力供給に伴い発生する筒内圧力の誤検出 を確実に防止することができる。  By doing so, the various functions and effects according to the present invention described above can be achieved, and furthermore, erroneous detection of the in-cylinder pressure generated due to power supply to the glow plug can be reliably prevented. .
〔図面の簡単な説明〕  [Brief description of drawings]
第 1図は、 本発明の第 1の実施形態における全体構成図である。  FIG. 1 is an overall configuration diagram according to a first embodiment of the present invention.
第 2図は、 本発明の第 2の実施形態における圧力センサの信号取出し部とグロ 一プラグ用電力供給端子との共用化を説明するための回路図である。  FIG. 2 is a circuit diagram for explaining a common use of a signal extraction unit of a pressure sensor and a power supply terminal for a global plug according to a second embodiment of the present invention.
第 3図は、 従来の筒内圧力検出装置の全体構成を説明する図である。  FIG. 3 is a diagram illustrating the overall configuration of a conventional in-cylinder pressure detecting device.
第 4図は、 従来の圧力センサの拡大断面図である。  FIG. 4 is an enlarged sectional view of a conventional pressure sensor.
〔発明を実施するための最良の形態〕  [Best mode for carrying out the invention]
以下に、 本発明にかかるディーゼル機関の筒内圧力検出装置の実施例を、 添付 の図面に基づき説明する。  An embodiment of the in-cylinder pressure detecting device for a diesel engine according to the present invention will be described below with reference to the accompanying drawings.
本発明の第 1の実施例では、 図 1に示すように、 副室式ディーゼル機関の気筒 内 （副室） に直接臨んでシリンダへッド 1に取り付けられるグロ一プラグ 3に、 圧力センサ 2を内装させるようにする。 In the first embodiment of the present invention, as shown in FIG. The pressure sensor 2 is installed inside the glow plug 3 that is attached to the cylinder head 1 directly facing the inside (sub chamber).
詳しくは、 圧力センサ 2は、 グロ一プラグ 3のセラミックヒーター部 4と、 筒 状のボディ一 5内に圧入ゃ铸込み等により形成され前記セラミックヒーター部 4 を固定するためのセラミックゃ絶縁性樹脂等からなる固定部材 6と、 の間に挟み 込ませるようになっている。 前記セラミックヒータ一部 4力 \ 本発明に係る筒内 圧力受圧部材に相当する。  More specifically, the pressure sensor 2 includes a ceramic heater portion 4 of a glow plug 3 and a ceramic insulating resin formed by press-fitting into a cylindrical body 15 for fixing the ceramic heater portion 4. It is designed to be sandwiched between a fixing member 6 made of, for example, and. The ceramic heater partially corresponds to the in-cylinder pressure receiving member according to the present invention.
なお、 本実施例で用いる圧力センサ 2は、 前述した従来と同様のものであって 構わないし、 リング状でなく平板状であってもよいし、 その他の既知の圧力セン サを採用することができるものである。  Note that the pressure sensor 2 used in the present embodiment may be the same as the conventional one described above, may be a plate shape instead of a ring shape, or may employ another known pressure sensor. You can do it.
ところで、 圧力センサ 2のリード線 2 Aや、 グロ一プラグ用電力供給端子 8に 接続されるグローブラグ用配線 7は、 絶縁性を有する前記固定部材 6の内部を通 過させて取り出すようにするのが絶縁性確保の面で好ましい。 なお、 前記固定部 材 6を中空円筒形状等で形成し、 その中空部を通過させて、 リード線 2 Aやグロ 一プラグ用配線 7を取り出すようにしてもよい。  By the way, the lead wire 2 A of the pressure sensor 2 and the glove lug wiring 7 connected to the power supply terminal 8 for the glow plug are passed through the inside of the insulating fixed member 6 so as to be taken out. This is preferable in terms of securing insulation. The fixing member 6 may be formed in a hollow cylindrical shape or the like, and the lead wire 2A or the wiring 7 for the glow plug may be taken out through the hollow portion.
このように、 本実施例によれば、 圧力センサ 2を、 グロ一プラグ 3のセラミツ クヒ一夕一部 4と、 固定部材 6と、 の間に挟み込ませるようにしたので、 圧力セ ンサ 2は、 気筒内に臨んで気筒内の圧力を受けて変位或いは変形するセラミック ヒータ一部 4の変位を直接検出することになるので、 従来のように、 比較的剛性 の高いシリンダへッドの弾性変形を検出して間接的に筒内圧力を検出するものに 比べ、 筒内圧変化に対する検出変位量を大きくでき、 以つて大幅に検出精度を向 上させることができる。  As described above, according to the present embodiment, the pressure sensor 2 is sandwiched between the ceramic plug part 4 of the glow plug 3 and the fixing member 6, so that the pressure sensor 2 is However, since the displacement of the ceramic heater part 4 that is displaced or deformed by receiving the pressure in the cylinder as it faces the cylinder is directly detected, the elastic deformation of the relatively rigid cylinder head, as in the past, As compared with the method of detecting the in-cylinder pressure by detecting the in-cylinder pressure, the amount of detection displacement with respect to the change in the in-cylinder pressure can be increased, and the detection accuracy can be greatly improved.
また、 セラミックヒーター部 4は、 他の気筒から完全に独立しており、 圧力を 検出したい気筒以外の気筒の筒内圧力の影響を受けることがないので、 かかる点 でも、 従来のように、 他の気筒の筒内圧力の影響 （シリンダブロックの変形の影 響も含む） を比較的受け易いシリンダへッドの変形を検出して筒内圧力を検出す るものに比べ、 大幅に検出精度を向上させることができる。  In addition, the ceramic heater section 4 is completely independent of other cylinders and is not affected by the in-cylinder pressure of the cylinders other than the cylinder whose pressure is to be detected. The detection accuracy is greatly improved as compared to the method that detects the cylinder pressure by detecting the deformation of the cylinder head, which is relatively susceptible to the influence of the cylinder pressure (including the effect of cylinder block deformation). Can be improved.
更に、 圧力センサ 2をグロ一プラグ 3に内装させたので、 省スペース化が図れ ると共に、 圧力センサをグロ一プラグ 3の外部に挿入等した従来のものに比べ、 組み付け性等を向上させることができると共に、 従来のように、 圧力センサから のリード線がグロ一プラグの締付用六角部の外部に剥き出しとならないので、 作 業性の大幅な改善や断線の可能性を大幅に低減することができる。 Furthermore, since the pressure sensor 2 is housed inside the glow plug 3, space can be saved. In addition to the conventional one in which the pressure sensor is inserted outside the glow plug 3, etc., the assemblability can be improved, and the lead wire from the pressure sensor is tightened as in the conventional case. Since it is not exposed to the outside of the hexagonal part, the workability can be greatly improved and the possibility of disconnection can be greatly reduced.
なお、 本実施例では、 前記固定部材 6を、 セラミックや絶縁性樹脂等で形成す るとして説明したが、 これに限らず、 金属性の部材であっても構わない。 但し、 この場合には、 圧力センサ 2のリード線 2 Aや、 グロ一プラグ用配線 7には、 シ 一ルドが必要となる。  In the present embodiment, the fixing member 6 has been described as being formed of ceramic, insulating resin, or the like, but is not limited thereto, and may be a metal member. However, in this case, a shield is required for the lead wire 2 A of the pressure sensor 2 and the wiring 7 for the glow plug.
また、 本実施例では、 セラミックヒータ一式のグロ一プラグに関して説明した 力、 これに限らず、 金属性の鞘 （シース） の内部に発熱コイルを備えるようにし た所謂シーズド型のグロ一プラグにおいて、 前記金属性の鞘の端部と、 当該鞘を ボディ一に位置固定するための固定部材と、 の間に、 圧力センサを介装するよう に構成しても良い。 このように構成しても、 上述の本発明の作用効果と同様の作 用効果を奏することができるのは勿論である。  In the present embodiment, the force described with respect to the ceramic heater set glow plug is not limited thereto. In a so-called sheathed glow plug in which a heating coil is provided inside a metallic sheath (sheath), A pressure sensor may be interposed between an end of the metal sheath and a fixing member for fixing the position of the sheath to the body. Even with such a configuration, it is needless to say that the same operation and effect as the above-described operation and effect of the present invention can be obtained.
即ち、 気筒内に臨んで配設されるグロ一プラグの構成部材のうち、 筒内圧力の 作用を受ける筒内圧カ受圧部材 （例えば、 セラミックヒ一夕部 4や前記金属性の 鞘等が相当する） と、 前記筒内圧力受圧部材をグロープラグのボディ 5の所定位 置に固定しておくための固定部材 6と、 の間に、 圧力センサを挟み込むように配 設すれば、 本発明の作用効果を奏することができるのである。 次に、 本発明の第 2の実施例について説明する。  That is, among the components of the glow plug disposed facing the inside of the cylinder, the in-cylinder pressure receiving member that receives the action of the in-cylinder pressure (for example, the ceramic sleeve 4 or the metallic sheath, etc.). ), And a fixing member 6 for fixing the in-cylinder pressure receiving member at a predetermined position of the body 5 of the glow plug, so that the pressure sensor is interposed therebetween. The effect can be achieved. Next, a second embodiment of the present invention will be described.
第 2の実施例では、 圧力センサ 2の配置構成等は、 基本的に第 1の実施例の場 合と同様であるが、 圧力センサ 2からの信号取出し部を、 グロ一プラグ用電力供 給端子 8と共用化するようにしている （第 1図の破線部分参照。 即ち、 第 1図に 破線で示すように、 リ一ド線 2 Aをグローブラグ用配線 7延いてはグローブラグ 用電力供給端子 8と接続するようにして、 グロ一プラグ 3の外部へ向けて伸びる リード線 2 Aを廃止するようにしたものである） 。  In the second embodiment, the arrangement and the like of the pressure sensor 2 are basically the same as those in the first embodiment, but the signal extraction unit from the pressure sensor 2 is connected to the power supply for the global plug. (See the broken line in Fig. 1. In other words, as shown by the broken line in Fig. 1, the lead wire 2A is connected to the glove lug wiring 7. By connecting to the supply terminal 8, the lead wire 2A extending to the outside of the glow plug 3 is eliminated.)
詳細には、 第 2図に示すように、 バッテリ （図示せず） と電力供給用端子 8と の間にスィッチ 1 0を介装し、 グロ一プラグ用電力供給端子 8の下流側で、 セラ ミックヒータ一部 4と、 圧力センサ 2と、 を並列接続するようになっている。 また、 グロ一プラグ用電力供給端子 8には、 圧力センサ 2の出力を入力し増幅 するためのチャージアンプ 1 1 (当該チャージアンプ 1 1は、 エンジンコント口 ールュニットに内装或いは接続されている） 力接続されている。 In detail, as shown in FIG. 2, a battery (not shown) and a power supply terminal 8 are provided. A switch 10 is interposed therebetween, and a part of the ceramic heater 4 and the pressure sensor 2 are connected in parallel on the downstream side of the power supply terminal 8 for the global plug. In addition, a charge amplifier 11 for inputting and amplifying the output of the pressure sensor 2 to the power supply terminal 8 for the green plug (the charge amplifier 11 is provided inside or connected to the engine control unit). It is connected.
なお、 前記スィッチ 1 0の ΟΝ · O F F切り換えは、 エンジンコントロールュ ニットからの駆動信号に基づレ、て行なわれるようになっている。  The switch of the switch 10 is switched based on a drive signal from the engine control unit.
このように、 圧力センサ 2からの信号取出し部を、 グロ一プラグ用電力供給端 子 8と共用化できるのは、 グロ一プラグ 3への通電は、 通常、 始動直前や始動時 に行なわせるものであり、 圧力センサ 2の出力は、 通常、 始動後に使用するもの である、 という特質を、 巧みに利用したことに因るものである。  As described above, the signal extraction unit from the pressure sensor 2 can be shared with the power supply terminal 8 for the glow plug because the power supply to the glow plug 3 is normally performed immediately before or at the start. This is due to the fact that the output of the pressure sensor 2 is usually used after the engine is started.
ここで、 本実施例におけるエンジンコントロールュニッ卜が行なう制御につい て、 以下に説明する。  Here, the control performed by the engine control unit in the present embodiment will be described below.
即ち、  That is,
①エンジンコントロールュニットでは、 キースィッチ （図示せず） 等からの信 号に基づいて、 例えば、 始動直前及び始動中を検出すると、 前記スィッチ 1 0を ONするようにする。 これにより、 始動前及び始動中には、 バッテリ 9からグロ —プラグ 3のセラミックヒ一夕一部 4へ通電が行なわれ、 良好に始動補助を行な わせることができる。  (1) In the engine control unit, when, for example, immediately before and during start-up is detected based on a signal from a key switch (not shown) or the like, the switch 10 is turned on. As a result, before and during the start-up, power is supplied from the battery 9 to the portion 4 of the ceramic plug of the glow plug 3 and the start-up can be favorably performed.
このときは、 前記チャージアンプ 1 1への入力信号は、 エンジンコントロール ユニットにおいては、 キャンセルする （データとして使用しない） ようにして、 筒内圧力の誤検出を防止するのが好ましい。  At this time, it is preferable that the input signal to the charge amplifier 11 is canceled (not used as data) in the engine control unit to prevent erroneous detection of the in-cylinder pressure.
②一方、 始動が終了すると或いは始動後所定時間経過すると、 今度は、 前記ス ィツチ 1 0を O F Fし、 ノくッテリ 9からのセラミックヒ一夕一部 4への通電を停 止させる。 そして、 ここで初めて、 エンジンコントロールユニットでは、 圧力セ ンサ 2からチャージアンプ 1 1へ入力される信号を、 デ一夕として使用するよう にする。  (2) On the other hand, when the start is completed or when a predetermined time has elapsed after the start, the switch 10 is turned off, and the power supply to the ceramic heater part 4 from the battery 9 is stopped. Then, for the first time, the engine control unit uses the signal input from the pressure sensor 2 to the charge amplifier 11 as a signal.
このように、 エンジンコントロールユニットにおいて、 グロ一プラグ 3への通 電は、 通常、 始動直前や始動時に行なわせるものであり、 圧力センサ 2の出力は、 通常、 始動後に使用するものである、 という特質を、 巧みに利用して、 スィッチ 1 0の切り換え制御や、 圧力センサ 2の出力の採用可否判断を行なわせるように したので、 圧力センサ 2からの信号取出し部を、 グロ一プラグ用電力供給端子 8 と共用化することができる。 従って、 圧力センサ 2の出力ハーネス等を省略する ことができるので、 構成の簡略化、 低コスト化を図れると共に、 ハーネスの取回 し作業等をより一層軽減することができる。 Thus, in the engine control unit, the Electricity is normally applied just before or at the time of start-up, and the output of the pressure sensor 2 is usually used after start-up. Since the determination as to whether or not to use the output of the pressure sensor 2 is made, the signal extraction unit from the pressure sensor 2 can be shared with the power supply terminal 8 for the global plug. Accordingly, the output harness of the pressure sensor 2 and the like can be omitted, so that the configuration can be simplified and the cost can be reduced, and the work of arranging the harness can be further reduced.
なお、 上記で説明してきた本発明における筒内圧力検出装置及び該装置の使用 方法は、 副室式ディーゼル機関の副室に臨ませてグロ一プラグを配設した場合に 限らず、 副室式ディーゼル機関の主燃焼室に臨ませた場合や、 直接噴射式のディ ーゼル機関の燃焼室にグローブラグを臨ませるようにした場合にも勿論適用でき るものである。  The in-cylinder pressure detecting device and the method of using the device in the present invention described above are not limited to the case where the glow plug is arranged facing the sub-chamber of the sub-chamber type diesel engine. Of course, the present invention can also be applied to a case where the glove lug faces the combustion chamber of a diesel engine of a direct injection type or a diesel combustion engine.
〔産業上の利用可能性〕  [Industrial applicability]
以上説明したように、 本発明にかかるディーゼル機関の筒内圧力検出装置及び 該装置の使用方法は、 簡単な構成で、 作業性が良く、 かつ、 設置スペースも問題 とならず、 筒内圧力を高精度に検出することができるという効果があり、 従って 産業上の利用可能性が大である。  As described above, the in-cylinder pressure detecting device for a diesel engine and the method of using the device according to the present invention have a simple configuration, good workability, and do not cause a problem in installation space. There is an effect that detection can be performed with high accuracy, and therefore, industrial applicability is great.

Claims

請求の章 囲 Claim chapter
( 1 ) ディーゼル機関の筒内圧力を検出するための筒内圧力検出装置であって、 気筒内に臨んで配設されるグロ一プラグの筒内圧力の作用を受ける筒内圧カ受 圧部材と、 当該筒内圧カ受圧部材をグロ一ブラグ本体に固定しておくための固定 部材と、 の間に、 圧力センサを介装させたことを特徴とするディーゼル機関の筒 内圧力検出装置。  (1) An in-cylinder pressure detecting device for detecting the in-cylinder pressure of a diesel engine, the in-cylinder pressure receiving member being subjected to the action of the in-cylinder pressure of a glow plug disposed in the cylinder. An in-cylinder pressure detecting device for a diesel engine, wherein a pressure sensor is interposed between a fixing member for fixing the in-cylinder pressure receiving member to the glow plug main body.
( 2 ) 前記圧力センサの出力取出し部を、 前記グロ一プラグの電力供給用端子と 共用化し、  (2) The output extraction part of the pressure sensor is shared with the power supply terminal of the glow plug,
前記グローブラグへ電力を供給する際に、 前記グローブラグの電力供給用端子 と電源とを接続し、  When supplying power to the glove lug, a power supply terminal of the glove lug is connected to a power supply,
その他の場合には、 前記グロ一プラグの電力供給用端子と電源とを遮断して、 前記グロ一ブラグの電力供給用端子から前記圧力センサの出力の取り出しを行な わせるようにしたことを特徴とする請求項 1記載のディーゼル機関の筒内圧カ検  In other cases, the power supply terminal of the glow plug and the power supply are shut off, and the output of the pressure sensor is taken out from the power supply terminal of the glow plug. The cylinder pressure detection of a diesel engine according to claim 1,
( 3 ) 前記グロ一プラグへの電力供給時に、 前記圧力センサの出力を検出値とし て使用しないことを特徴とする請求項 2記載のディーゼル機関の筒内圧力検出装 置。 (3) The in-cylinder pressure detecting device for a diesel engine according to claim 2, wherein an output of the pressure sensor is not used as a detection value when power is supplied to the glow plug.
( 4 ) 気筒内に臨んで配設されるグロ一プラグの筒内圧力の作用を受ける筒内圧 カ受圧部材と、 当該筒内圧カ受圧部材をグロ一プラグ本体に固定しておくための 固定部材と、 の間に、 圧力センサを介装させると共に、 前記圧力センサの出力取 出し部を、 前記グロ一プラグの電力供給用端子と共用化したディーゼル機関の筒 内圧力検出装置の使用方法であつて、  (4) An in-cylinder pressure receiving member that receives the action of the in-cylinder pressure of the glow plug disposed facing the cylinder, and a fixing member for fixing the in-cylinder pressure receiving member to the glow plug body. A method for using the in-cylinder pressure detection device of a diesel engine, in which a pressure sensor is interposed between and a power supply terminal of the glow plug is shared with an output output portion of the pressure sensor. hand,
前記グローブラグへ電力を供給する際に、 前記グローブラグの電力供給用端子 と電源とを接続し、  When supplying power to the glove lug, a power supply terminal of the glove lug is connected to a power supply,
その他の場合には、 前記グロ一プラグの電力供給用端子と電源とを遮断して、 前記グロ一プラグの電力供給用端子から前記圧力センサの出力の取り出しを行な わせるようにしたことを特徴とするディーゼル機関の筒内圧力検出装置の使用方 法。 In other cases, the power supply terminal of the glow plug and the power supply are shut off, and the output of the pressure sensor is taken out from the power supply terminal of the glow plug. How to use the in-cylinder pressure detector of a diesel engine Law.
( 5 ) 気筒内に臨んで配設されるグローブラグの筒内圧力の作用を受ける筒内圧 カ受圧部材と、 当該筒内圧カ受圧部材をグロ一プラグ本体に固定しておくための 固定部材と、 の間に、 圧力センサを介装させると共に、 前記圧力センサの出力取 出し部を、 前記グロ一プラグの電力供給用端子と共用化したディーゼル機関の筒 内圧力検出装置の使用方法であつて、  (5) An in-cylinder pressure receiving member that receives the action of the in-cylinder pressure of the glove lug disposed facing the cylinder, and a fixing member for fixing the in-cylinder pressure receiving member to the glow plug body. A method for using an in-cylinder pressure detecting device of a diesel engine, in which a pressure sensor is interposed between and a power output terminal of the glow plug is shared with a pressure output terminal of the pressure sensor. ,
前記グローブラグへ電力を供給する際に、 前記グローブラグの電力供給用端子 と電源とを接続し、  When supplying power to the glove lug, a power supply terminal of the glove lug is connected to a power supply,
その他の場合には、 前記グロ一ブラグの電力供給用端子と電源とを遮断して、 前記グロ一ブラグの電力供給用端子から前記圧力センサの出力の取り出しを行な わせるようにすると共に、  In other cases, the power supply terminal of the global plug and the power supply are shut off, and the output of the pressure sensor is taken out from the power supply terminal of the global plug,
前記グロ一ブラグへの電力供給時に、 前記圧力センサの出力を検出値として使 用しないようにしたことを特徴とするディーゼル機関の筒内圧力検出装置の使用 方法。  A method of using the in-cylinder pressure detection device for a diesel engine, wherein an output of the pressure sensor is not used as a detection value when power is supplied to the glow plug.
PCT/JP1996/002505 1995-09-05 1996-09-04 Cylinder inner pressure detector for diesel engines and method of using the same WO1997009567A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19680912T DE19680912C2 (en) 1995-09-05 1996-09-04 Device and method for detecting the cylinder pressure of a diesel engine

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP7/228193 1995-09-05
JP22819395A JP3177819B2 (en) 1995-09-05 1995-09-05 In-cylinder pressure detector for internal combustion engines

Publications (1)

Publication Number Publication Date
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EP1500879A1 (en) * 2003-07-21 2005-01-26 Robert Bosch Gmbh Glow plug with integral pressure sensing
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WO2005040602A1 (en) * 2003-09-29 2005-05-06 Robert Bosch Gmbh Sheathed-type glow plug comprising an integrated combustion chamber pressure sensor
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JP3177819B2 (en) 2001-06-18

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